File with COS
Author: Chen Wanfei
Implement file upload in JSP, a lot of available libraries, such as the famous JSPSMART SMARTupload, Struts is also available. I said COS, it is O'Reilly, O'Reilly book is very 8 wrong, this uploaded component is great, the most important thing is that it is Open Source.
Download the latest COS package (http://www.servlets.com/cos/index.html), join your ClassPath. Write a JSP that needs to upload files. For convenience, I use a simple HTM file. In this page, we let users upload 3 files at a time. /upload.htm
No title document </ title> </ head> <body> <! - ENCTYPE value is important, UPLOAD.JSP is the process uploaded JSP -> <form name = "form1" method = "post" enctype = "multipart / form-data" action = "upload.jsp"> <p> <input name = "file1" TYPE = "file"> </ p> <p> <input name = "file2" type = "file"> </ p> <p> <input name = "file3" type = "file"> </ p> <p> <input type = "submit" name = "submit" value = "Upload"> </ p> </ form> </ body> </ html> in C: / Request a directory C: / Upload, Used to store the uploaded file. Write a JSP or servlet to upload, I use a UPLOAD.JSP here, so you don't have to configure web.xml, huh, it is more lazy.</p>
<p>Upload.jsp <% @ page import = "java.io. *"%> <% @ page import = "com.oreilly.servlet.multipartRevent"%> <% @ page import = "com.oreilly.servlet.multipart. CoverFileresPolicy "%> <% @ page contenttype =" text / html; charset = GB2312 "%> <% // After upload, save in c: // upload string savedirectory =" c: // upload "; // Maximum 5M, up to 3 files, so ... int maxpostsize = 3 * 5 * 1024 * 1024; // Response encoding is "GB2312", using the default file name conflict resolution policy, implement MultipartRequest Multi = new MultipartRequest (request, saveDirectory, maxPostSize, "gb2312"); // output feedback Enumeration files = multi.getFileNames (); while (files.hasMoreElements ()) {System.err.println ( "ccc"); String name = (String) files.nextElement (); File f = multi.getFile (name); if (f = null!) {String fileName = multi.getFilesystemName (name); String lastFileName = saveDirectory "//" fileName; Out.println ("Uploaded file: lastfilename); out.println (" <hr> ");}}%> <meta http-equiv =" content-type "content =" text / html; charset = GB2312 "> Finally, the 2 files will be released to your server. Upload files will be done, you want to embed the function of sending attachments in your mail system, and use this to do it. Finally, I hope this article will inspire you, if there is a mistake, please criticize and correct!</p></div><div class="text-center mt-3 text-grey">
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